Eighteenth and nineteenth century philosophers took interest in humour and, in particular, humorous incongruities. Humour was not necessarily their main interest; however, observations on humour could support their more general philosophical theories. Spontaneous and unintentional humour such as anecdotes, witty remarks and absurd events were the styles of humour that they analysed and made part of their theories. Prepared humour such as verbal jokes were rarely included in their observations, likely dismissed as too vulgar and not requiring intellectual effort. Humour, as analysed by several eighteenth and nineteenth century philosophers, was seen as part of daily life or life simulated on stage. In the twentieth century, Freud emphasized ...